2 G. MORENO, D.W. MITCHELL, W.C. ROSING & S.L. STEPHENSON used for the genus encompasses a relatively large number of species, thus making it one of the more important genera within the myxomycetes. KIRK & al. (2008) recognized 35 species of Trichia, LADO ( ) recognized 34 species, and MITCHELL (2013) listed 33 taxa and 8 infraspecific taxa. The purpose of this paper is to describe a new species of Trichia, based on material appearing in moist chamber culture on pieces of the dead bark of Fagraea fragrans Roxb. collected from Labrador Park in Singapore. The species can be distinguished from other similar members of the genus by a combination of macro- and microscopic characters, which are described herein. This work completes the previous contribution of ROSING & al. (2011). MATERIALS AND METHODS The material upon which the description of this new species is based was studied in the Department of Plant Biology at the University of Alcalá de Madrid (AH), where small portions of the type material (2 slides) are preserved as isotypes. Sporocarps for detailed study were mounted in Hoyer s medium following the method described by KOSKE & TESSIER (1983) and SCHNITTLER & NOVOZHILOV (1996). Spores were measured, including surface structures such as spines or warts, with the use of an oil immersion lens. Light microscopy (LM) was carried out with a Nikon microscope equipped with an automatic photographic system. The SEM micrographs were produced with a Zeiss DSM- 950 microscope. For ultramicroscopic studies, the material to be examined was rehydrated in concentrated ammonium hydroxide (28 30%) for 30 minutes, dehydrated in aqueous ethanol (70%) for 30 minutes, fixed for 2 hours in pure ethylene glycol dimethyl ether (= 1,2 dimethoxymethane) and finally immersed in pure acetone for at least 2 hours. This was followed by critical point drying and sputtering with gold-palladium. This technique allows the use of very little material (i.e., part of a single sporocarp or sometimes no more than a few spores). Terminology used to describe spore ornamentation follows that of RAMMELOO (1974, 1975). DESCRIPTION Trichia nodosa G. Moreno, D.W. Mitch., W.C. Rosing & S.L. Stephenson, sp. nov. Figs MycoBank MB Etymology: nodosa derived from latin nodosus with nodes in the capillitium. Specimen studied: Republic of Singapore, Singapore, Labrador Park (1º 16 0 N, 103º E), appearing on dead bark of Fagraea fragrans Roxb. in moist chamber culture, leg. W. C. Rosing, 10-III-2009, WCR in AH Holotype. Sporocarps gregarious, stipate. Sporotheca mm, globose to subglobose, sometime fused in pairs, dark purplish-brown to dark brown, with yellow-brown markings that indicate where dehiscence will occur (Fig. 1). Stipe mm long, blackish, rough longitudinally, longer than the sporotheca (Fig. 1). Peridium single, membranous, thickened with dark brown areolae of refuse material, pale yellow-brown and somewhat glossy between the areolae. Dehiscence areolate, the areolae appearing as dark purplish brown patches by LM (Fig. 2). Hypothallus membranous and poorly developed, dark brown. Plasmodium unknown. Spores 7-8 µm in diam., globose to subglobose, yellowish, verrucose (Fig. 9). Capillitium abundant, dense, consisting of yellowish elaters 5-6 µm wide and with abundant free ends and nodes (Figs. 3-8). The ends are short, acutely pointed and µm in length (Figs. 3-4). The nodules are globose to ellipsoidal and covered with spines 5-12 µm in length (Figs. 6-8). Sometimes, the nodules are terminal and replace the acute tips. By SEM the filaments of the capillitium are seen to be covered by sinuous spirals, which cause the wall to be decorated with a reticulum (Figs ) which is not visible by LM. The nodules have spines of variable dimensions (Figs ). 2 Bol. Soc. Micol. Madrid

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